3.1.3. Density
During experiments, olive oil volume changes were measured by observation of piston displacement inside the high-pressure chamber. It was measured by digital caliper gauge. Corrections related to the expansion of the chamber were considered during data analysis. Measured volume changes versus pressure have been used for evaluation of olive oil density as a function of pressure, for various temperatures, see Fig. 4. The olive oil density shows a piecewise monotonically continuous behavior of r versus the pressure for various values of temperature. Discontinuity in the curve indicates that the liquid-to-solid phase transition occurs.